started with this:
http://www.homedepot.com/p/Husky-1-4-in-Air-Compressor-Filter-HDA70403AV/100027474
then got, at home depot, (Or lowes sells this also I think...possibly different manufacturer, but the same deal) got the fittings for both ends there..1/4 x what ever the hose is...think is it 3/8 (maybe 5/8, but think it is 3/8) which I got the hose there also. then just made a bracket to mount it where I wanted it. you will need two screws for the bracket to bolt to the unit...not sure on the size of those, I just kept trying out of my bolt barrel until I found two. you may want to find those at home depot while you are there as well. I did that the first one I made which was much easier. I made my bracket for my son's car out of a plastic piece I had that was L shaped and drilled two holes in it. the one for my car, I got an L-shaped piece of aluminum at home depot and cut it the size I wanted then drilled the two holes to mount it. I used the tube from the car with the hose I bought. also, I always glue the valve at the bottom to keep it from leaking. then you just unscrew the container and empty it and screw it back on. I like it since I can always easily see how much is in it.
here is one I made for another car.